Revolving chair.



No. 679,958. Patented Aug. 6, |901.

J. ELLENBECKER.

REVOLVING CHAIR.

(A\pp1ication led Sept. 10, 1900.)

(No Model.)

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UNiTnD STATES APATENT OFFICE.

JOHN `ELLENBEOKER, OF PORT WASHINGTON, VISCONSIN.

REVOLVING CHAIR.

SPECIFICATION forming part of Letters Patent No. 679,958, dated August6, 1901.

Application tiled September 10, 1900. Serial No. 29,500. (No model.)

To all whom it may concern:

Beit known that I, JOHN ELLENBECKER, of Port Washington, in the countyof Ozaukee and State of Wisconsin, have invented a new and usefulImprovement in Revolving Chairs, of which the following is adescription, reference being had to the accompanying drawings, which area part of this specification.

My invention relates to improvements in revolving chairs, and especiallyin the means wherebyT the seat of a chair is made revoluble and in themeans adapted for raising and lowering the seat.

The invention consists of the devices and their combinations as hereindescribed and claimed or the equivalent thereof.

In the drawings, Figure 1 is a section of the principal members-of theconstruction embodying my invention. Fig. 2 is a view of the under sideof the nut and its hand- Wheel with related parts, a locking andretaining device being shown in section. Fig. 3 is a top plan viewof thehub. Fig. lshows a coupling-ring employed to couple the head of thespindle to the sleeve revolubly. Fig.

- 5 is a view of the end at the top of the sleeve.

Fig. 6 shows the spindle foot-block in connection with a fragment of thesleeve in section. Fig. 7 shows a modified form Vof a nutretainingdevice in connection with a fragment of the hub 'and of the nut and itshandwheel.

In the drawings, 1 is the metal hub, to which the spreading legs of thechair are secured for supporting the chair thereon. The hub is providedwith a longitudinal bore having a smooth surface and provided at oneside with a groove 2. An elongated hollow sleeve 3, screwthreaded on itsexterior, is fitted slidable vertically in the bore of the hub and isheld against revolution therein by a pin 4, fixed in the sleeve andprojecting into the groove 2. A nut 5 turning on the thread of thesleeve rests on the top of the hub and is adapted by being rotated toraise and lower the sleeve and its load inthe hub. The nut is providedwith a hand-wheel 6 for conveniently rotating it. An annular flange 7,secured to and forming a part of the handwheel, in connection with acoupling device 8, secured to the hub, is a means for holding the nutand the sleeve revolubly to the hub. The

:of the iiange 7.

coupling device is advisably secured to the hub releasably by means of ascrew 9. The coupling device 8 is also advisably of elastic material andis provided with a catchrlO, adapted to enternotches therefor in theedge The overturned head of the coupling device 8 is above the flange 7and prevents the nut and the sleeve from being lifted from the hub 1,and the catch 10 enter-V ingany one of the notches therefor in the ange7 locks the nut releasably in position against rotation.

The sleeve 3 on its interior surface is provided medially with anannular boss contracting the size of its bore and forming a shoulder 12at the top of the boss. A cylindrical spindle-block 13 fits in the boreof the sleeve and is provided with an annular shoulder, that is seatedon the shoulder 12 of the boss 11. This spindle-block is advisablyconstructed of chilled iron or other exceedinglyhard metal, whereby itis adapted to resist wear. This spindle-block is advisably provided witha wedge-shaped rib 14 on the exterior surface of its contractedportion,`which fits into a correspondingly-shaped recess in the boss 11,whereby the spindle-block is secured in the sleeve releasably andagainst rotation. The spindle-block may also be secured in the sleeve,if desired, by a removable pin 15, though such pin is not ordinarilyrequired.

The chair-seat spindle 1G projects downwardly in the sleeve 3 and isfitted and supported rotatively in the spindle-block 13. Thespindle-block is advisably provided with a socket in its upper end toreceive the spindle therein. The spindle-head 17 is Xed on the upper endof the spindle. The spindle and spindle-head may be constructedintegrally; but preferably the spindle-head 17 is const-ructed ofcastmetal, and the spindle 16 is preferably of stee1,inserted in andsecured rigidly to the spindle-head. The spindle is supported revolublyin the sleeve 3, at or near the upper extremity of the sleeve,conveniently by means of an annular flange or bushing 18, formed on thehead 17 about the spindle 16 and fitting rotatively in the bore ofthesleeve. A coupling-ring 19 is provided at its lower end with an inwardlyprojecting annular ange 20, that turns under a correspondingly IOOoutwardly-turned annular head on thesleeve 3, and the coupling-ring atits other end is provided with an outwardly-extending bev-4 eled lip 2l,adapted to engage a catch 22 on the spindle-head 17. The coupling-ring19 may also be secured to the spindle-head by a screw 23, turning into alip on the ring opposite the lip 2l. This constructibn couples thesleeve 3 to the spindle-head rotatably, but so as to prevent theaccidental removal of the spindle from the sleeve by lifting thechairseat or otherwise. Y

In the modifiedV form ofconstruction shown in Fig. 7 the flange 7 isturned outwardly, and the coupling device S is reversed from theposition shown in Fig. l. Otherwise the construction is the same as thatshown in Figs. 1 andl 2 y What I- claim as my invention is- 1'. Incombination, a smooth-bore hub provided with a longitudinal groove, ahollow eX ternally-screw-threaded slee ve slidable endwise in the huband provided interiorly with an inwardly-projecting annular shoulder andwith a pin projecting exteriorly into the groove in the hub, a nu-'tresting on the hub and turning on the thread of the sleeve, a detachable spindle-block seated on the annular shoulder in the sleeve, anda spindle yfooted in the block and rotatable in the sleeve.

Y 2. In combination, a smooth-bore hub, a holloweXteriorly-screw-threaded sleeve provided medially with an interiorinwardly-project-,ing shoulder and slidable endWise inthe bore of thehu-b, meansv securing the sleeve 33 and rotatable in the sleeve.

device fixed on the hub and disposed to engage said flange and preventthe escape of the nut and the sleeve from the hub and to hold the nutreleasablyagainst rotation.

4. In combinationv,.aJ smooth-bore hub, a hollowexter-iorlyrScreW-threaded sleeve loose `in* the hfub, a uut.resting onthe hub andtnrningl by its'screW-thread on the sleeve, means -holdingthe nut to the hub rotatively, a spindle provided with a head, thespindle being seated'rotatively in the sleeve, and a coupling-ringsecu-red detachably to the spindlehead-and engaging and connecting thesleeve rotatively to the spindle-head.

In testimony whereof I affix my signature in presence of two Witnesses.

JOHN ELLENBECKER'.

Witnesses: y

WILLIAM AHLHAUSER, JOSEPH; GITZEN.

